Angular analysis of $B\to K^{*}{e}^{+}{e}^{-}$ in the low- $q^2$ region with new electron identification at Belle

Journal Article · 08 October 2024 · Physical Review. D.

DOI: https://doi.org/10.1103/PhysRevD.110.072005 · OSTI ID:2460580

Ferlewicz, D. ; Urquijo, P. ; Adachi, I. ; Adamczyk, K. ; Aihara, H. ; Asner, D. M. ; Atmacan, H. ; Ayad, R. ; Babu, V. ; Banerjee, Sw. ; Behera, P. ; Belous, K. ; Bennett, J. ; Bessner, M. ; Bhardwaj, V. ; Bhuyan, B. ; Bilka, T. ; Biswas, D. ; Bodrov, D. ; Bračko, M. ; Branchini, P. ; Browder, T. E. ; Budano, A. ; Campajola, M. ; Cao, L. ; Červenkov, D. ; Chang, M. -C. ; Cheon, B. G. ; Chilikin, K. ; Cho, H. E. ; Cho, K. ; Choi, S. -K. ; Choi, Y. ; Choudhury, S. ; Das, S. ; Dash, N. ; de Marino, G. ; De Pietro, G. ; Dhamija, R. ; Di Capua, F. ; Dingfelder, J. ; Doležal, Z. ; Dong, T. V. ; Dubey, S. ; Ecker, P. ; Epifanov, D. ; Ferber, T. ; Fulsom, B. G. ; Gaur, V. ; Garmash, A. ; Giri, A. ; Goldenzweig, P. ; Graziani, E. ; Gu, T. ; Guan, Y. ; Gudkova, K. ; Hadjivasiliou, C. ; Hara, T. ; Hayasaka, K. ; Hayashii, H. ; Hazra, S. ; Hedges, M. T. ; Herrmann, D. ; Hou, W. -S. ; Hsu, C. -L. ; Iijima, T. ; Ishikawa, A. ; Itoh, R. ; Iwasaki, M. ; Jacobs, W. W. ; Jia, S. ; Jin, Y. ; Kaliyar, A. B. ; Kiesling, C. ; Kim, C. H. ; Kim, D. Y. ; Kim, K. -H. ; Kim, Y. -K. ; Kinoshita, K. ; Kodyš, P. ; Konno, T. ; Korobov, A. ; Korpar, S. ; Kou, E. ; Kovalenko, E. ; Križan, P. ; Krokovny, P. ; Kuhr, T. ; Kumar, R. ; Kumara, K. ; Kuzmin, A. ; Kwon, Y. -J. ; Lai, Y. -T. ; Lam, T. ; Lee, S. C. ; Levit, D. ; Lewis, P. ; Li, L. K. ; Li, Y. B. ; Li Gioi, L. ; Libby, J. ; Liventsev, D. ; Ma, Y. ; Matvienko, D. ; Meier, F. ; Merola, M. ; Metzner, F. ; Miyabayashi, K. ; Mizuk, R. ; Mohanty, G. B. ; Nakamura, I. ; Nakao, M. ; Natochii, A. ; Nayak, L. ; Nishida, S. ; Ogawa, S. ; Ono, H. ; Pardi, S. ; Park, J. ; Passeri, A. ; Patra, S. ; Paul, S. ; Pedlar, T. K. ; Pestotnik, R. ; Piilonen, L. E. ; Podobnik, T. ; Prencipe, E. ; Prim, M. T. ; Rout, N. ; Russo, G. ; Sandilya, S. ; Savinov, V. ; Schnell, G. ; Schwanda, C. ; Seino, Y. ; Senyo, K. ; Sevior, M. E. ; Shan, W. ; Sharma, C. ; Shiu, J. -G. ; Shwartz, B. ; Solovieva, E. ; Starič, M. ; Sumihama, M. ; Takizawa, M. ; Tamponi, U. ; Tanida, K. ; Tenchini, F. ; Uchida, M. ; Unno, Y. ; Uno, S. ; Ushiroda, Y. ; Vahsen, S. E. ; Varvell, K. E. ; Wang, E. ; Wang, M. -Z. ; Watanuki, S. ; Won, E. ; Yabsley, B. D. ; Yan, W. ; Yang, S. B. ; Yelton, J. ; Yin, J. H. ; Yuan, C. Z. ; Yuan, L. ; Yusa, Y. ; Zhang, Z. P. ; Zhilich, V. ; Zhukova, V.

We perform an angular analysis of the $B\to K^{*}{e}^{+}{e}^{-}$ decay for the dielectron mass squared, $q^2$ , range of $0.0008–1.1200{\mathrm{GeV}}^2/c^4$ using the full Belle dataset in the $K^{*0}\to K^{+}{\pi }^{-}$ and $K^{*+}\to K_S^0{\pi }^{+}$ channels, incorporating new methods of electron identification to improve the statistical power of the dataset. This analysis is sensitive to contributions from right-handed currents from physics beyond the Standard Model by constraining the Wilson coefficients ${\mathcal{C}}_7^{(\prime )}$ . We perform a fit to the $B\to K^{*}{e}^{+}{e}^{-}$ differential decay rate and measure the imaginary component of the transversality amplitude to be $A_T^{\mathrm{Im}}=-1.27\pm 0.52\pm 0.12$ , and the $K^{*}$ transverse asymmetry to be $A_T^{\left(2\right)}=0.52\pm 0.53\pm 0.11$ , with $F_L$ and $A_T^{\mathrm{Re}}$ fixed to the Standard Model values. The resulting constraints on the value of ${\mathcal{C}}_7^{\prime }$ are consistent with the Standard Model within a $2\sigma$ confidence interval. Published by the American Physical Society 2024

• Sponsoring Organization: USDOE
• OSTI ID: 2460580
• Journal Information: Physical Review. D., Journal Name: Physical Review. D. Journal Issue: 7 Vol. 110; ISSN PRVDAQ; ISSN 2470-0010
• Publisher: American Physical SocietyCopyright Statement
• Country of Publication: United States
• Language: English